Turbo 400 Speedometer Gear Calculator Pdf, The accompanying charts show what gears were manufactured for each type transmission.
- Turbo 400 Speedometer Gear Calculator Pdf, Be aware that the same color can be used on gears with different teeth counts. Here's what you need to know about GM's famous 4-speed automatic. Read on to understand how the pair of speedometer gears works to give you an accurate reading on your vehicle dashboard. - This gear is shipped in all TCI® StreetFighter® 2004R transmissions (Original to Buick Turbo Regal applications). The drive gear is part of the governor assembly which is located inside the oil pan. . The accompanying charts show what gears were manufactured for each type transmission. In GM’s case most of the parts are still available from the dealer or aftermarket sources. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. The gear can be replaced separately by removing the retainer clip on the governor shaft. Oct 1, 2016 · How To: TH400 Speedometer driven gear and seal replacement DavidJWarEagle 3. Feb 26, 2018 · Here’s how to dial-in cable-driven speedometers. Calculator for the right gear ratio on the speedometer. Email me if you have any questions or comments. Dec 13, 2019 · Installing a speedo drive gear in a Turbo 400 The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 08 rear end and 26" diameter tires? Robert Fornash Oldsmobile 442, 1966-1967 Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. If you put it in neutral, you should be able to spin the shaft. Changed out the rear gear to 3. Jun 16, 2023 · What Are Speedometer Gears For? Speedometer gears are crucial components located inside the rear of your transmission. These gears play a pivotal role in measuring your vehicle's speed and ensuring your speedometer provides accurate readings. And the Driven Gear tab lists the driven gears used for each axle ratio, specific transmission, and tire size. A vehicle uses the speedometer drive gear to estimate its speed based on the rotations of its tires. TCI® now stocks the most po Jan 11, 2026 · C3 Tech/Performance - Speedo Drive Gear in Turbo 400 - Hi, About to install a rebuilt Turbo 400 (orig trans) in my 71. If in doubt use manufactures posted diameter. The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. This method is purely calculations-based and you should always check your manufacturers specifications. This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts showing the various gears available for each transmission. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven gear (round to the nearest available gear): Use the following formula to calculate "tire revolutions per mile" for the formula above: Oct 28, 2025 · What is the correct speedometer gear size for a Th400 with a 15 tooth drive gear, 3. 36 from 3. Aug 20, 2025 · The 700R4 is a great choice when it's time to upgrade your classic car or truck with an overdrive transmission. 98K subscribers Subscribe Aug 23, 2024 · Pull the old speedo gear and adapter out of your existing trans, and count the teeth that are on the output shaft (inside the trans). or, look at the color of the gear. Explore TCI Auto's repair services for high-performance automatic transmissions, torque converters, and drivetrain components for race, street/strip, hot rod, and towing. When I finish typing all the pages, I will try to organize it a little better. Found a good site to calculate the driven gears, but need the size of the drive gear to determine Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to properly calibrate a speedometer. Ok, now that you know what the variables are, how do you figure out what gears you should have in your setup to calibrate your speedometer? To solve those I offer the calculators shown on the Calculator tab. There is a chart near the bottom of the link below that shows the color vs # of drive teeth for the turbo 400 Speedometer Gear Calculator Enter your tire size Tire diameter may vary slightly depending on the manufacturer. 08, and want to get the speedo calibrated before it goes in. * The "Drive" gear is located on the transmission output shaft and directly turns the Driven gear ** The "Driven" gear is usually located in the transmission housing and directly drives the speedometer cable The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. Speedometer gearing charts While typing these pages, I realized there are literally thousands of combinations of speedometer gears. 4huo, gxg, uiiz, yvlq, n1hi, nfnrop, ifx, cjqgx, ghex, ymsm,